植物必需的微量营养元素锌、锰、钼、硼、铜在土壤中供给不足或过剩时,都可能引起植物、动物及人体生理功能失调,生长发育受阻,诱发出各种特殊的生理病害。明确土壤中微量元素含量分布规律及其有效性问题,有助于采取措施来调剂微量元素的供应水 The essential micronutrients of plants, such as zinc, manganese, molybdenum, boron and copper, can cause the physiological functions of plants, animals and human body to be imbalanced, the growth and development are hindered and all kinds of special physiological diseases are induced when they are supplied insufficiently or excessively in the soil. Clarification of the distribution of trace elements in soils and their effectiveness issues help to take measures to regulate the supply of trace elements